-#![feature(plugin)]
-#![plugin(clippy)]
+// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
-#![deny(never_loop)]
-#![allow(dead_code, unused)]
+#![allow(
+ clippy::single_match,
+ unused_assignments,
+ unused_variables,
+ clippy::while_immutable_condition
+)]
-fn main() {
+fn test1() {
+ let mut x = 0;
loop {
- println!("This is only ever printed once");
+ // clippy::never_loop
+ x += 1;
+ if x == 1 {
+ return;
+ }
break;
}
+}
- let x = 1;
+fn test2() {
+ let mut x = 0;
loop {
- println!("This, too"); // but that's OK
+ x += 1;
if x == 1 {
break;
}
}
+}
+fn test3() {
+ let mut x = 0;
loop {
- loop {
- // another one
+ // never loops
+ x += 1;
+ break;
+ }
+}
+
+fn test4() {
+ let mut x = 1;
+ loop {
+ x += 1;
+ match x {
+ 5 => return,
+ _ => (),
+ }
+ }
+}
+
+fn test5() {
+ let i = 0;
+ loop {
+ // never loops
+ while i == 0 {
+ // never loops
break;
}
- break;
+ return;
+ }
+}
+
+fn test6() {
+ let mut x = 0;
+ 'outer: loop {
+ x += 1;
+ loop {
+ // never loops
+ if x == 5 {
+ break;
+ }
+ continue 'outer;
+ }
+ return;
+ }
+}
+
+fn test7() {
+ let mut x = 0;
+ loop {
+ x += 1;
+ match x {
+ 1 => continue,
+ _ => (),
+ }
+ return;
+ }
+}
+
+fn test8() {
+ let mut x = 0;
+ loop {
+ x += 1;
+ match x {
+ 5 => return,
+ _ => continue,
+ }
+ }
+}
+
+fn test9() {
+ let x = Some(1);
+ while let Some(y) = x {
+ // never loops
+ return;
}
+}
+fn test10() {
+ for x in 0..10 {
+ // never loops
+ match x {
+ 1 => break,
+ _ => return,
+ }
+ }
+}
+
+fn test11<F: FnMut() -> i32>(mut f: F) {
loop {
+ return match f() {
+ 1 => continue,
+ _ => (),
+ };
+ }
+}
+
+pub fn test12(a: bool, b: bool) {
+ 'label: loop {
loop {
- if x == 1 { return; }
+ if a {
+ continue 'label;
+ }
+ if b {
+ break;
+ }
+ }
+ break;
+ }
+}
+
+pub fn test13() {
+ let mut a = true;
+ loop {
+ // infinite loop
+ while a {
+ if true {
+ a = false;
+ continue;
+ }
+ return;
+ }
+ }
+}
+
+pub fn test14() {
+ let mut a = true;
+ 'outer: while a {
+ // never loops
+ while a {
+ if a {
+ a = false;
+ continue;
+ }
}
+ break 'outer;
}
}
+
+// Issue #1991: the outter loop should not warn.
+pub fn test15() {
+ 'label: loop {
+ while false {
+ break 'label;
+ }
+ }
+}
+
+fn main() {
+ test1();
+ test2();
+ test3();
+ test4();
+ test5();
+ test6();
+ test7();
+ test8();
+ test9();
+ test10();
+ test11(|| 0);
+ test12(true, false);
+ test13();
+ test14();
+}